Electric-arc lamp.



Nn.- 668,345. Patented Feb. I9, |90!-v T. F. BARRETT.

ELEGTBIC ARG LAMP.

(Application led. Ocrt.'15, 1.900.` (No Model.)

2 Sheets-Sheet I.

Patented Feb. I9, i901;

No. 668,345. T. F. BARRETT.

ELECTRIC ABC LAMP. (Eppcation filed Oct. 15, 1900.1

2 Sheets-She'et 2'.

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THOMAS F. BARRETT, OF CHICAGO, ILLINOIS, ASSIGNOR OF TWO-TIIIRDS TOJAMES P. BARRETT AND FRED C. JONES, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 668,345, dated February19, 1901. Application filed October 15, 1900. Serial No. 33,032. (Nomodel.)

To @ZZ whom, t may concern:

Bo it known that I, THOMAS F. BARRETT, a citizen of the United States ofAmerica, residing at Chicago, in the county of Cook and State ofIllinois, have invented certainnew and useful Improvements inInterchangeable Sockets for Arc-Lights, of which the following is aspecification.

My invention relates to a certain novel and improved interchangeablesocket designed for use in connection with a number of the ordinaryarclights,the socket being so constructed as to be readily attachable toany one of the frames used in said arc-lights and also so as to greatlyincrease the life of the carbons.

The invention consists in certain novel characteristics exemplified inthe socket described below and defined in the claims at the end of thisspecification.

In the drawings, Figure 1 is an elevation of one form of arc-light,ordinarily called the Thomson-Houston. Fig. 2 is a vertical diametricalsection of the lamp shown in Fig. 1. Fig. 3 is a perspective of ascrew-threaded bushing which is placed within the lower portion of thechimney. Fig. 4 is a perspective of a collar screw-threaded at one endto fit Within the bushing and at the other to fit over the socket. Fig.5 is a detail plan of a portion of Fig. 1 with the chimney and collarremoved. Fig. 6 is an under plan of the parts seen in Fig. 5. Fig. 7 isa detail elevation,

-partly in vertical diametrical section, of a part of an ordinaryelectric-light frame, such asp is used in the lamp known as theStandard. Fig. 8 is a similar view of the same portion of a frame usedin the lamp known as the Western; and Fig. 9 is a similar view, partlyin dotted lines, of a lamp known as the Wood The portions of the variousarc-lights shown in the drawings are used merely to illustrate theadvantages of the invention, and for that reason it is thoughtunnecessary to enter into a detail description or illustration of thesame.

Taking up rst the socket which forms the subject of this application andreferring to Fig. 2, A is a preferably circular block having a portion aat the top externally screwthreaded and provided with a vertical holeCL2 in its upper surface to receive the lower carbon X of the lamp. Aset-screw a3 provides means for securing the carbon in place. Below theportion a of the block is a portion a4, preferably somewhat reduced forthe lsake of appearance, and below the portion 61,4 is aneXternally-screw-threaded reduced portion a5, below which is a stillfurther reduced externally-screw-threaded portion a6. A collar B, Fig.4, has a lower portion b, threaded to the part a of the block, and anupper reduced portion b', threaded to the interior of a bushing C, Fig.3, said bushing being provided with a Haring rim c, adapted to conformto the inside of the chimney, which is shown at Y in Fig. 2. A washer D,preferably of asbestos, is desirable between the chimney and the collarB, and a second washer E rests upon the top of the chimney and is helddown by an ordinary cap F, perforated at fto receive the upper carbon Z.By screwing the collar B tightly to the bushing C an approximatelyair-tight closure with the chimney is produced, and a similar closure iseffected by the cap and bushing at the top. The collar B, with thechimney secured to it, is screwed upon the block A, closing the interiorof the collar. Upon the portion a5 of the block is threaded a nut G, andupon the portion a6 is threaded a nut H. The latter is preferablyelongated, as seen in Fig. 6. Said Fig. 6 also shows at I the ordinaryThomson-Houston cup, which contains a central perforation i. Thisperforation I preferably out away at a tb, so that by turning the nut Hto register with these notches the same may be withdrawn from the bottomof the cup without entire removal from the block. The socket is securedto the cup I by clamping the latter firmly between the nuts Gr H.

In Fig. 1 the frame .I of the ordinary Thomson-Houston lamp is shown,the cup I (seen in Fig. 6) being secured to the lower portion thereofand the upper carbons Z being supported from the upper partyl of theframe in the Vordinary manner.

Inasmuch as the details of the frame and the working parts of the lampform no part of this invention, it is unnecessary to describe orillustrate the same.

Turning to Fig. 7, the frame K of the Standard lamp is shown containingat its IOO lower portion an internally-screW-threaded socket 7c, towhich the externally screwthreaded portion a5 of the block A is fitted.

Fig. 8 shows the ordinary Western frame M, the lower portion of whichcontains a cup-shaped portion/m, centrally perforated at m', and theintermediate portion a4 of the block is so proportioned as to rest uponthe margin of this perforation, to which it is tightly clamped by meansof the nut H.

In Fig. 9 the frame N. of the Wood lamp is shown, and said framecontains a screwthreaded socket n, in which is secured a post n', on thetop of which is a socket n2, provided with a set-screw n3, and the lowerportion a6 of the block is so proportioned as to lit within this socketand be tightly secured therein by means of the set-screw n3.

It will be noticed that the socket as adapted to the Thomson-Houstonlamp in Figs. l to respectively, is so constructed as to be also adaptedto the other threelamps, (shown in Figs. 7, 8, and 9,) it beingdesirable for the sake of appearance only that the nut G be removed inapplying the socket to said three other lamps and that the nut H also bere moved in applying the socket to the lamps shown in Figs. 7 and 9.

The comparatively air-tight closu re eected at the top and bottom of thechimney confines the gases within the chimney, preventing a supplyof-fresh oxygen and Vgreatly increasing the life of the carbons.

I do not limit myself to the specific details above described except asclearly set forth in lthe following claims.

I claim as new and desire to secure by Letters Patentl. In a socket forarc-lamps, the combination with a socket-block, A, provided at the topwith means of support for the chimney and the lower carbon respectively,and below the same provided with the externallyfSCP@W-threaded portion,a5, and at the bottom with the reduced screw-threaded portion, a6, ofthe nut, G, threaded to the portion, 0.5, and the nut, H, threaded tothe port-ion, a6; substantially as described.

2.' In an electric lam p,the combination with the cup, I, having thecentral perforation, z', containing the marginal notches, ia, i, of thesocket-block, A, having means for supporting the lower carbons and thechimney at the top, and provided below the same with the screw-threadedportion, a5, and the reduced screw threaded port-ion, a6, the nut, G,threaded to the portion, a5, and the elongated nut, H, threaded to theportion, a6, and adapted to pass through the notches in the cup;substantially as described.

In witness whereof I have hereunto set my hand at Chicago, in the countyof Cook and State of Illinois, this 27th day of September,

